This paper describes and discusses the psychopathology and demographic data of 922 schizophernic inpatients (aged 15-66) who had been diagnosed according to DSM-III criteria in state mental hospitals of Iran. Data were collected via semistructured interviews (during 1985-91) by psychologists and trained research assistants from the Tehran Psychiatric Institute. In this research depressed mood, inappropriate affect, incoherence and circumstantiality, persecutory and grandiose delusions, and auditory hallucination were found to be more prevalent than other psychiatric symptoms.